Which version of ISLR is referred in skillets Tree Based Algorithms?

I was going through the skill test: https://www.analyticsvidhya.com/blog/2016/12/detailed-solutions-for-skilltest-tree-based-algorithms/

and in question 23, the author ( Faizal https://www.analyticsvidhya.com/blog/author/jalfaizy/) mentions “Refer Pg. 314 of ISLR”, which version of the book is referred to here?

The link to amazon books will help the readers like me.

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